get Username ?

I am developing custom workflow.once task is created,user is approvaing that task .ex: User "A" is start workflow and assign to User "B".then USer "B" is approveing that document. once task is finihed. i want todisplay name of the user who approved that document in task list.. (in OUTCOMEfield )..how to get Username of the current user of that site.

i tried... workflowproperties.web.currentuser....i am gettingsystem/sharepoint.. but not current user.please suggest me regarding this

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